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- PDB-6uwz: Cryo-EM structure of Torpedo acetylcholine receptor in complex wi... -

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Entry
Database: PDB / ID: 6uwz
TitleCryo-EM structure of Torpedo acetylcholine receptor in complex with alpha-bungarotoxin
Components
  • (Acetylcholine receptor subunit ...) x 4
  • Alpha-bungarotoxin
KeywordsTRANSPORT PROTEIN / Nicotinic acetylcholine receptor / nicotinic receptor / Torpedo / Cys-loop receptor / ion channel / neurotoxin
Function / homology
Function and homology information


acetylcholine receptor inhibitor activity / acetylcholine-gated monoatomic cation-selective channel activity / ion channel regulator activity / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / transmembrane signaling receptor activity / toxin activity / postsynaptic membrane / extracellular region
Similarity search - Function
Neurotransmitter-gated ion-channel transmembrane domain / Snake toxin, conserved site / Snake toxins signature. / : / Snake toxin cobra-type / Snake three-finger toxin / CD59 / CD59 / Nicotinic acetylcholine receptor / Acetylcholine Binding Protein; Chain: A, ...Neurotransmitter-gated ion-channel transmembrane domain / Snake toxin, conserved site / Snake toxins signature. / : / Snake toxin cobra-type / Snake three-finger toxin / CD59 / CD59 / Nicotinic acetylcholine receptor / Acetylcholine Binding Protein; Chain: A, / Neurotransmitter-gated ion-channel ligand-binding domain / Snake toxin-like superfamily / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain / Neurotransmitter-gated ion-channel ligand-binding domain superfamily / Neurotransmitter-gated ion-channel ligand binding domain / Methane Monooxygenase Hydroxylase; Chain G, domain 1 / Distorted Sandwich / Ribbon / Up-down Bundle / Mainly Beta / Mainly Alpha
Similarity search - Domain/homology
N-OCTANE / Chem-POV / Acetylcholine receptor subunit alpha / Acetylcholine receptor subunit beta / Acetylcholine receptor subunit gamma / Acetylcholine receptor subunit delta / Alpha-bungarotoxin
Similarity search - Component
Biological speciesTetronarce californica (Pacific electric ray)
Bungarus multicinctus (many-banded krait)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.69 Å
AuthorsRahman, M.M. / Teng, J. / Worrell, B.T. / Noveillo, C.M. / Lee, M. / Karlin, A. / Stowell, M. / Hibbs, R.E.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA) United States
CitationJournal: Neuron / Year: 2020
Title: Structure of the Native Muscle-type Nicotinic Receptor and Inhibition by Snake Venom Toxins.
Authors: Md Mahfuzur Rahman / Jinfeng Teng / Brady T Worrell / Colleen M Noviello / Myeongseon Lee / Arthur Karlin / Michael H B Stowell / Ryan E Hibbs /
Abstract: The nicotinic acetylcholine receptor, a pentameric ligand-gated ion channel, converts the free energy of binding of the neurotransmitter acetylcholine into opening of its central pore. Here we ...The nicotinic acetylcholine receptor, a pentameric ligand-gated ion channel, converts the free energy of binding of the neurotransmitter acetylcholine into opening of its central pore. Here we present the first high-resolution structure of the receptor type found in muscle-endplate membrane and in the muscle-derived electric tissues of fish. The native receptor was purified from Torpedo electric tissue and functionally reconstituted in lipids optimal for cryo-electron microscopy. The receptor was stabilized in a closed state by the binding of α-bungarotoxin. The structure reveals the binding of a toxin molecule at each of two subunit interfaces in a manner that would block the binding of acetylcholine. It also reveals a closed gate in the ion-conducting pore, formed by hydrophobic amino acid side chains, located ∼60 Å from the toxin binding sites. The structure provides a framework for understanding gating in ligand-gated channels and how mutations in the acetylcholine receptor cause congenital myasthenic syndromes.
History
DepositionNov 6, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 15, 2020Provider: repository / Type: Initial release
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Revision 1.1Apr 22, 2020Group: Database references / Category: citation / citation_author
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Revision 2.0Jul 29, 2020Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Derived calculations / Structure summary
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Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.type_symbol / _chem_comp.name / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_unobs_or_zero_occ_atoms.label_asym_id / _pdbx_validate_close_contact.auth_asym_id_1 / _pdbx_validate_close_contact.auth_asym_id_2 / _pdbx_validate_close_contact.auth_seq_id_1 / _pdbx_validate_close_contact.auth_seq_id_2 / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_role / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 2.1Apr 2, 2025Group: Data collection / Database references / Structure summary
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Structure visualization

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Assembly

Deposited unit
A: Acetylcholine receptor subunit alpha
B: Acetylcholine receptor subunit delta
C: Acetylcholine receptor subunit beta
D: Acetylcholine receptor subunit alpha
E: Acetylcholine receptor subunit gamma
F: Alpha-bungarotoxin
G: Alpha-bungarotoxin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)294,42521
Polymers284,2787
Non-polymers10,14614
Water2,486138
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Acetylcholine receptor subunit ... , 4 types, 5 molecules ADBCE

#1: Protein Acetylcholine receptor subunit alpha


Mass: 50168.164 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Tetronarce californica (Pacific electric ray)
References: UniProt: P02710
#2: Protein Acetylcholine receptor subunit delta


Mass: 57625.711 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Tetronarce californica (Pacific electric ray)
References: UniProt: P02718
#3: Protein Acetylcholine receptor subunit beta


Mass: 53731.773 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Tetronarce californica (Pacific electric ray)
References: UniProt: P02712
#4: Protein Acetylcholine receptor subunit gamma


Mass: 56574.094 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Tetronarce californica (Pacific electric ray)
References: UniProt: P02714

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Protein , 1 types, 2 molecules FG

#5: Protein Alpha-bungarotoxin / Alpha-Btx / Alpha-bungarotoxin isoform A31 / BGTX A31 / Long neurotoxin 1


Mass: 8005.281 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) Bungarus multicinctus (many-banded krait) / References: UniProt: P60615

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Sugars , 4 types, 8 molecules

#6: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1721.527 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-2DManpa1-3[DManpa1-2DManpa1-6[DManpa1-3]DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,10,9/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-g1_d2-e1_e2-f1_g3-h1_g6-i1_i2-j1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}}}}}}LINUCSPDB-CARE
#7: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#8: Polysaccharide alpha-D-mannopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 951.875 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-6DManpa1-6DGlcpNAcb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5]/1-1-1-2-2/a4-b1_b4-c1_c6-d1_d6-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(6+1)][a-D-Manp]{[(6+1)][a-D-Manp]{}}}}}}LINUCSPDB-CARE
#10: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 3 types, 144 molecules

#9: Chemical
ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC


Mass: 760.076 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Formula: C42H82NO8P / Comment: phospholipid*YM
#11: Chemical ChemComp-OCT / N-OCTANE


Mass: 114.229 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: C8H18
#12: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 138 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Torpedo acetylcholine receptor in complex with alpha-bungarotoxin
Type: COMPLEX / Entity ID: #1-#5 / Source: NATURAL
Molecular weightUnits: KILODALTONS/NANOMETER / Experimental value: NO
Source (natural)Organism: Tetronarce californica (Pacific electric ray)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 35 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
4RELION3CTF correction
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.69 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 127482 / Algorithm: BACK PROJECTION / Symmetry type: POINT

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